Implement SyncWarden v0.1.0

Full Syncthing tray wrapper with:
- System tray with 5 icon states (idle/syncing/paused/error/disconnected)
- Syncthing REST API client with auto-discovered API key
- Long-polling event listener for real-time status
- Transfer rate monitoring, folder tracking, recent files, conflict counting
- Full context menu with folders, recent files, settings toggles
- Embedded admin panel binary (webview, requires CGO)
- OS notifications via beeep (per-event configurable)
- Syncthing process management with auto-restart
- Cross-platform installer with autostart
- CI pipeline for Linux (.deb + .tar.gz) and Windows (.zip)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

internal/monitor/state.go

@@ -0,0 +1,64 @@
+package monitor
+
+import (
+	"time"
+
+	"git.davoryn.de/calic/syncwarden/internal/icons"
+)
+
+// AggregateStatus holds the full aggregated status for the tray.
+type AggregateStatus struct {
+	State          icons.State
+	DevicesTotal   int
+	DevicesOnline  int
+	DownRate       float64 // bytes/sec
+	UpRate         float64 // bytes/sec
+	LastSync       time.Time
+	Paused         bool
+	RecentFiles    []RecentFile
+	ConflictCount  int
+	Folders        []FolderInfo
+	PendingDevices int
+}
+
+// FolderInfo holds per-folder info for the menu.
+type FolderInfo struct {
+	ID    string
+	Label string
+	Path  string
+	State string // "idle", "syncing", "scanning", "error", etc.
+}
+
+// RecentFile records a recently synced file.
+type RecentFile struct {
+	Name      string
+	Folder    string
+	Timestamp time.Time
+}
+
+// stateFromFolders determines the aggregate icon state from folder states.
+func stateFromFolders(folders []FolderInfo, paused bool) icons.State {
+	if paused {
+		return icons.StatePaused
+	}
+
+	hasError := false
+	hasSyncing := false
+
+	for _, f := range folders {
+		switch f.State {
+		case "error":
+			hasError = true
+		case "syncing", "sync-preparing", "scanning", "sync-waiting", "scan-waiting":
+			hasSyncing = true
+		}
+	}
+
+	if hasError {
+		return icons.StateError
+	}
+	if hasSyncing {
+		return icons.StateSyncing
+	}
+	return icons.StateIdle
+}